fix(line): not stop existing expand animation when update.

[Ovilia]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Line clipping animation was skipped if calling setOption when the first clipping animation is not done.

Fixed issues

#15581

Details

Before: What was the problem?

option = {
    xAxis: {
        type: 'category',
        boundaryGap: false,
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        type: 'value'
    },
    series: [{
        data: [820, 932, 901, 934, 1290, 1330, 1320],
        type: 'line',
        areaStyle: {}
    }],
    animationDuration: 5000,
    animationDurationUpdate: 5000
};

setTimeout(function() {
    myChart.setOption(option);
}, 1000);

After: How is it fixed in this PR?

Clipping animation should be continued.

Misc

• The API has been changed (apache/echarts-doc#xxx).
• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

NA.

Others

Merging options

• Please squash the commits into a single one when merge.

Other information

[echarts-bot]

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[echarts-bot]

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